JP2013545687A - Yarn separation type device - Google Patents

Abstract

  The device (10) is capable of supplying the yarn (15) for knitting and separating each winding. The device (10) comprises a wheel / drum (12) connected to the motor, directly or indirectly, rotatable about an axis (16), the wheel / drum (12) being on its outer surface. In order to allow each winding (15) of the yarn wound around the wheel / drum (12) to proceed, it is provided with a series of slits (20) that house corresponding blades (22) that are contoured. The blade (22) rotates with the wheel / drum (12) but is centered on an axis (26) having an inclination (α) and / or an eccentricity (e) with respect to the axis (16) of the wheel / drum (12). As a result, the profile of the blade (22) protruding from each slit (20) gradually changes from minimum to maximum along the circumference of the wheel / drum (12) and then gradually. However, the change remains constant over time. In addition, the blade (22) has such a length that it can receive all the windings (15) that the device (10) processes.

Description

  The present invention relates to a yarn supply device for knitting, and more particularly, to a device that enables supply of yarn and separation of each winding of the yarn.

  For knitting, various types of yarn supply devices are known as prior art. All known yarn feeders have a wheel or cylinder on which the yarn is wound in one or more turns. For this reason, it is fundamentally important to prevent these yarns from overlapping and “tightening” during yarn feeding. This actually causes thread breakage and defects in the finished product.

  These wheel-type yarn feeders are provided with means for preventing the yarns wound around the wheels from overlapping each other, or the wheels themselves are configured to perform this function.

  The wheel can be constituted by a rotating member (rotated by a motor), or a fixed member on which a yarn is loaded by an external member (also operated by a motor), depending on the operating procedure of the supply device. .

  An electric wheel type supply device provided with a fixed separation device is already known. Specifically, the fixed type separation device is a fixed bar disposed near the electric wheel, and is located in the same plane as the axis of the electric wheel type supply device, but is inclined with respect to this axis (the latest type). Then this slope can be adjusted). The yarn coming out of the bobbin is wound around the wheel bar assembly by one or more turns without straddling due to the inclination of the bar.

  There is also known an electric wheel type supply device that prevents the windings of yarns from overlapping each other by slightly tilting the rotation axis of the wheel with respect to the horizontal direction. In this way, the points where the yarn enters the wheel and the points away from the wheel are in two different parallel vertical planes so that the yarn turns are arranged side by side even if the yarn turns are not separated. As a result, the windings of the yarn on the wheel do not overlap each other.

  In another known solution, a protruding ring located in a plane slightly inclined with respect to a plane perpendicular to the axis of the wheel is fixed to the peripheral surface of the electric wheel / drum so that the drum and thus the ring rotates. , The yarn forming the first winding (closest to the point where the yarn enters) is pulled out by the tilted ring, and at the same time, another winding already present on the drum is lined up along the drum towards the exit They are slid with their mutual gaps filled. Furthermore, in another known solution, the stationary drum is provided with a series of slits, preferably equiangularly spaced, on the cylindrical surface, with each blade oscillating periodically and protruding from the associated slit. Thus, the yarn winding is arranged so as to proceed toward the exit point. This periodic swinging motion of the blade is caused by the external motor member without depending on the unwinding of the yarn, and is generally the same as that used for the operation of the yarn winding and loading member. . The winding load member accumulates the yarn on the fixed drum and then advances in a state where the winding is separated from each other by the swinging motion of the blade.

  These solutions have various disadvantages analyzed in the following in their basic characteristics.

  The solution having an electric wheel with a fixed bar separation device has the advantage that the windings on the wheel can be adjusted and separated effectively. However, there is also a disadvantage that friction occurs due to the rubbing of the yarn on the fixed bar. This limits the maximum number of yarn turns that can actually be wound on the wheel, and further damages the yarn that is exposed to continuous mechanical stress. In addition, this friction also constrains the minimum tension at which the device can operate, increasing the energy consumed to rotate the wheel. And the larger the working tension and the number of turns, the greater the power required by the motor.

  The solution of tilting the electric wheel has the disadvantage that accurate separation cannot be obtained (as mentioned above, the windings are in contact with each other). Basically, a small “moving” surface between the wheel and the thread is used to allow the winding to slide over the wheel, ie the thread contacts the wheel all around it. Although not, the protruding ribs parallel to the wheel's axis of rotation (referred to in technical terms as spokes) contact the wheel only at specific points. As a result, the first winding prompts the next winding, so that the mutual interval is reduced. Also, in general, this type of feeder is intended to be used with certain yarns along with a fixed bar separator.

  The solution that the electric wheel comprises a tilted ring also does not give an accurate separation (as mentioned above, the windings in this case are in contact with each other). It has the same restriction as the solution means that it is tilted, and in particular, due to friction, there is a conspicuous restriction in particular yarns (for example, elastic yarn). Furthermore, the disadvantage of this solution is that the yarn twists when it is unwound from the bobbin via the feeding device (this twisting increases or decreases with respect to the natural yarn twisting) and causes problems during production. Thus, there is a risk of changing the inherent characteristics of the yarn.

  The solution of having a stationary drum with periodically oscillating blades has the advantage of providing an accurate mutual separation between each winding of the yarn. However, there is also a drawback that the yarn drawn from the bobbin is subjected to twisting (this twisting is increased or decreased with respect to natural yarn twisting). Another drawback of this solution is that because the drum is fixed, the oscillating blade cannot move the yarn over the drum due to friction between the yarn and the drum, and therefore certain yarns ( In particular, it cannot handle elastic yarns).

  U.S. Pat. No. 3,971,522 makes it possible to eliminate some of the above drawbacks. Specifically, the solution (see the embodiment of FIG. 3) comprises an electric wheel / drum that rotates about an axis, and is centered on an axis that is inclined and eccentric with respect to the axis of rotation of the wheel / drum. As a series of slit rows of corresponding equiangular spacing to accommodate the teeth of the rotatable wheel. Thus, such teeth or blades remain constant over time so that their respective protrusions are minimized to maximum and then minimized along the circumference of the wheel / drum. Make different protrusions from the corresponding slits to change gradually. These blades have a profile in the direction of the associated wheel axis. This profile allows the last formed yarn winding to be separated from the previously formed winding, while each winding passes from the blade to the wheel / drum as the winding proceeds. However, it accumulates by contact with each other (shown in FIG. 6 of US Pat. No. 3,971,522), resulting in the disadvantages already mentioned.

  U.S. Pat. No. 2,431,712 also makes it possible to eliminate some of the above-mentioned drawbacks. This is achieved by providing blades housed in corresponding slits on a rotatable wheel / drum. However, the protrusions of the individual blades oscillate so as to change periodically over time. Even in this case, the winding of the yarn passes from the blade to the wheel / drum and accumulates and comes into contact with each other.

  It is an object of the present invention to provide a yarn feed separation type apparatus that does not cause the above-mentioned drawbacks. This object is achieved by a yarn feed separation type device according to the appended claims.

  The invention will become more apparent from the following description of one of its exemplary embodiments. In the following description, reference is made to the accompanying drawings.

It is a side view of the apparatus which concerns on this invention. It is a front view in the arrow 2 direction of FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. FIG. 2 is the same side view as FIG. 1, but the yarn is wound with each winding separated.

  As shown in these figures, the apparatus 10 for feeding / dispensing knitting yarn comprises a wheel / drum 12. The wheel / drum 12 is attached to an electric shaft 14 whose axis coincides with the axis 16 of the wheel / drum 12 in a conventional manner. This causes the wheel / drum 12 to rotate with the shaft 14 when the associated motor is activated.

  The outer surface of the wheel / drum 12 around which the yarn 15 (FIG. 4) is wound in a plurality of turns has a cylindrical shape with a protruding end 18 on the side where the shaft 14 is located. The outer surface has a series of slits 20 (9 in the illustrated embodiment) that are equiangularly spaced. Each slit 20 accommodates a blade 22. The blade 22 assembly is dragged to rotate with the wheel / drum 12 as the wheel / drum 12 is rotated. From the accompanying drawings, the radial projection of each blade 22 from each slit 20 has a maximum projection at the top of the blade 22, zero projection at the bottom of the blade 22, and projection at the top of the blade 22. It can be seen that it gradually changes along the circumference of the wheel / drum 12 so that is returned to the maximum. It should be noted that the protrusion of each blade 22 is not affected by the rotation of the wheel / drum 12 since it does not change over time. This is because the blade 22 is secured to an annular member 24 having an axis 26 that is inclined at an angle α with respect to the axis 16 of the wheel / drum 12. The annular member 24 is fixed to the bearing 28 supported by the shaft 14 with the same axis line so that the annular member 24 can freely rotate around the shaft 14 while having the required inclination α. Since the relative rotation between the bearing 28 and the shaft 14 is limited (ie, very limited) to the clearance that exists between the blade 22 and the associated slit 20, a suitable bronze bearing barrel It should be noted that a suitable ring of material with a low coefficient of friction (eg Teflon) can be used, but if necessary, a rolling bearing formed in a suitable shape can be used. is there.

  1 and 3, it can be seen that the blade 22 has an outer contour that is slightly inclined with respect to the axis 16 to facilitate the progress of winding of the yarn on the wheel / drum 12.

  Instead of tilting the axis 26 of the assembly of the blade 22 relative to the axis 16, the axis 26 of the blade 22 assembly simply does not intersect the axis 16 of the wheel / drum 12 (thus in this case between the two axes). Note that the same result can be obtained by tilting the two axes and providing the eccentricity between the two axes, as indicated by “e”. There is a need to. Even if the eccentricity e actually exists, it cannot be discriminated in reality even if the figure is looked at closely, but is shown in FIG. 3 for easy understanding.

  It is obvious to a mechanics expert, but a means (for example, a screw adjusting means or a mechanical actuator) capable of adjusting the inclination α and / or the eccentricity e may be provided (for the sake of simplicity, the drawing shows This has the advantage that the degree of separation between each winding of the yarn can be adjusted.

  The drive shaft can also be aligned with the axis of the assembly of blades 22 and the wheel / drum 12 is driven to be eccentric about the axis 26 and / or about the tilted axis 16. It should be noted that this can be done.

  In order for the friction between the yarn 15 and the outer surface of the wheel / drum 12 to be as small as possible and to allow the yarn to proceed easily during separation, the outer surface is merely loaded with the yarn (obviously the blade Projecting ribs 23 (spokes) can be provided in parallel to the axis 16 (in addition to being mounted on 22).

  According to the experiments performed, the number of blades and the ratio of the surface area of the wheel / drum in contact with the yarn to the surface area of the blade in contact with the yarn is the minimum separation distance d guaranteed between each winding. It became clear that it was a function of value.

  According to this experiment, it has been found that two parameter values, eccentricity e and inclination α, are fundamentally important for accurate separation of each winding of the yarn. In particular, the eccentricity e is a function of the diameter of the wheel / drum 12 and the inclination α determines the distance (d) that each turn must be separated from each other. For example, for a wheel / drum with a diameter of 30 mm to 60 mm, in order to ensure good separation, the eccentricity e must be 0 mm to 10 mm and the slope α must be 0 to 30 °. Must not be zero.

  The transmission of rotational movement from the wheel / drum 12 to the blade 22 assembly (or vice versa) is not only in direct contact between the blade and the corresponding side of the slit 20 (as shown in the embodiments of the accompanying drawings, It should be noted that it can also be obtained by electromagnetic coupling (which is possible by interposing a material member having vibration damping properties such as silicone rubber or neoprene sponge member).

  It is important to note the following: The yarn feed separation type device according to the invention makes it possible for the device 10 to obtain and maintain an effective separation d in all these yarn windings (the above separation is even adjustable). ). Furthermore, as long as the blade 22 is long enough to accommodate all the turns in the device 10, a number of turns can be obtained in the device 10 with a minimum yarn unwinding tension of the yarn 15. (In any case, more than the number of windings obtained with the known device). Thereby, sliding of the thread | yarn 15 can be prevented.

  In addition, it is important to note the following: The number of windings does not affect the rotational force of the wheel / drum 12. This is exactly because the wheel / drum 12 is not fixed, rotates with the blade 22, and the thread 15 does not receive any twist (when the thread enters or exits). The yarn winding separation operation is synchronized with the wheel / drum rotation and thus the yarn feeding. Finally, it should be noted that thanks to the rotation of the wheel / drum, it is not affected by friction, so that the device according to the invention operates without any problem using any kind of yarn (especially elastic yarn). is important.

[0001]
[0001]
The present invention relates to a yarn supply device for a knitted fabric described in the prerequisite section of the main claim , and more particularly to a device that enables supply of yarn and separation of each winding of the yarn.

Also, U.S. Pat. No. 2,431,712 discloses the contents described in the prerequisites section of the main claim, which also makes it possible to eliminate some of the above-mentioned drawbacks. This is achieved by providing blades housed in corresponding slits on a rotatable wheel / drum. However, the protrusions of the individual blades oscillate so as to change periodically over time. Even in this case, the winding of the yarn passes from the blade to the wheel / drum and accumulates and comes into contact with each other.
French Patent No. 1001138 and US Pat. No. 2303052 relate to an apparatus having the structure described in the prerequisites section of the main claim.

Claims (10)

A device (10) for supplying knitting yarn (15) and separating (d) each winding,
A wheel / drum (12) connected to the motor, directly or indirectly, rotatable about an axis (16);
The wheel / drum (12) has a corresponding blade (22) with a contour protruding on its outer surface so that each winding (15) of the thread wound around the wheel / drum (12) can travel. A series of slits (20) to accommodate
With
The blade (22) rotates with the wheel / drum (12) but is inclined (α) and / or eccentric (e) with respect to the axis (16) of the wheel / drum (12). , So that the profile of the blade (22) protruding from each slit (20) gradually changes from minimum to maximum along the circumference of the wheel / drum (12). And then gradually return to the minimum, but in the device (10) where the change is kept constant over time,
A device (10) characterized in that said blade (22) has a length capable of receiving all said windings (15) to be processed by the device.   The wheel / drum (12) is mounted on a drive shaft (14) with the same axis and the blade (22) assembly is dragged by the wheel / drum (12). Device (10).   The blade (22) assembly is mounted on a drive shaft with the same axis and the wheel / drum (12) is dragged and rotated by the blade (22) assembly. A device (10) according to claim 1.   The assembly of the blade (22) is fixed to the annular member (24) with the same axis, and the axis (26) of the annular member (24) is the axis (16) of the wheel / drum (12). ) And an angle (α) with respect to the axis (16) of the drive shaft (14) to which the wheel / drum (12) is fixed, and the annular member (24) The shaft (14) is fixed to the bearing (28) rotatably supported by the shaft (14) so that the shaft (14) can be rotated around the drive shaft (14) with the inclination (α). Item 10. The apparatus (10) according to Item 2.   The device (10) according to claim 4, wherein the bearing (28) is made of a material having a low coefficient of friction.   The drag is performed by interference between the blade (22) and a corresponding end of the slit (20), and the material member having vibration damping characteristics corresponds to the slit (20) corresponding to each blade (22). The device (10) according to claim 2, wherein the device (10) is interposed between the end of the device.   3. The device (10) according to claim 2, wherein the dragging of the blade (22) assembly by the wheel / drum (12) is performed by electromagnetic coupling.   The outer surface of the wheel / drum (12) has a protruding rib (23) parallel to the shaft (14), and the thread (15) rests on the blade (22). The device (10) according to claim 1, wherein the device (10) is wound in the form of a winding also resting on the rib (23).   The means adjust the inclination (α) of the assembly axis (26) of the blade (22) relative to the axis (16) and / or the axis (26) relative to the axis (16). The degree of separation (d) between the windings (15) of the yarn wound around the wheel / drum (12) is adjusted by means for adjusting the eccentricity (e) of Device (10).   When the wheel / drum (12) has a diameter of 30 mm to 60 mm, the eccentricity (e) is 0 mm to 10 mm, and the inclination (a) is 0 ° to 30 °, and these are zero at the same time. The device (10) according to claim 1, wherein

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